treewide: fix #include errors after gcc-5.4

They were mostly missing <cmath> or <math.h>.

pkgs/games/cataclysm-dda/default.nix

@@ -21,6 +21,9 @@ stdenv.mkDerivation rec {
     sed -i Makefile \
       -e 's,-Werror,,g' \
       -e 's,\(DATA_PREFIX=$(PREFIX)/share/\)cataclysm-dda/,\1,g'
+
+    sed '1i#include <cmath>' \
+      -i src/{crafting,skill,weather_data,melee,vehicle,overmap,iuse_actor}.cpp
   '';
 
   makeFlags = "PREFIX=$(out) LUA=1 TILES=1 SOUND=1 RELEASE=1 USE_HOME_DIR=1";

pkgs/games/dwarf-fortress/dfhack/default.nix

@@ -39,6 +39,7 @@ in stdenv.mkDerivation rec {
   };
 
   patches = [ ./use-system-libraries.patch ];
+  postPatch = "sed '1i#include <math.h>' -i plugins/3dveins.cpp";
 
   nativeBuildInputs = [ cmake perl XMLLibXML XMLLibXSLT fakegit ];
   # we can't use native Lua; upstream uses private headers

pkgs/games/dwarf-fortress/unfuck.nix

@@ -13,6 +13,8 @@ stdenv.mkDerivation {
     sha256 = "12bqh3k4wsk1c0bz2zly8h0ilbsdmsbwr9cdjc6i7liwg9906g7i";
   };
 
+  postPatch = "sed '1i#include <math.h>' -i g_src/ttf_manager.cpp";
+
   cmakeFlags = [
     "-DGTK2_GLIBCONFIG_INCLUDE_DIR=${glib.out}/lib/glib-2.0/include"
     "-DGTK2_GDKCONFIG_INCLUDE_DIR=${gtk2.out}/lib/gtk-2.0/include"

pkgs/games/openspades/default.nix

@@ -16,7 +16,10 @@ stdenv.mkDerivation rec {
   postPatch = ''
     substituteInPlace Sources/Client/Client_Input.cpp --replace "isnan(" "std::isnan("
     substituteInPlace Sources/Client/Corpse.cpp --replace "isnan(" "std::isnan("
-    substituteInPlace Sources/Draw/SWMapRenderer.cpp --replace "isnan(" "std::isnan(" --replace "isinf(" "std::isinf("
+    substituteInPlace Sources/Draw/SWMapRenderer.cpp \
+      --replace "isnan(" "std::isnan(" --replace "isinf(" "std::isinf("
+    sed '1i#include <cmath>' -i Sources/Client/{Player,Client_Input,Corpse}.cpp \
+      -i Sources/Draw/SWMapRenderer.cpp
   '';
 
   nativeBuildInputs = 

pkgs/games/openspades/git.nix

@@ -14,6 +14,8 @@ stdenv.mkDerivation rec {
     sha256 = "0vyvmgim03q8pcmfa1i0njr4w1lpjq5g3b47f67v9b5c5jcjycwn";
   };
 
+  postPatch = "sed '1i#include <cmath>' -i Sources/Client/{,Client}Player.cpp";
+
   nativeBuildInputs = 
     with stdenv.lib;
     [ cmake curl glew makeWrapper mesa SDL2 SDL2_image unzip wget zlib ]

pkgs/games/the-butterfly-effect/default.nix

@@ -9,8 +9,12 @@ stdenv.mkDerivation rec {
     sha256 = "1cs4q9qiakfd2m1lvfsvfgf8yvhxzmc06glng5d80piwyn6ymzxg";
   };
 
+  postPatch = "sed '1i#include <vector>' -i src/model/World.h";
+
   buildInputs = [ qt4 box2d which cmake ];
 
+  enableParallelBuilding = true;
+
   installPhase = ''
     make DESTDIR=.. install
     mkdir -p $out/bin